I deal with a lot of remote offices located in parts of the world where the local grid power supply is unreliable.
- Power can go off anytime with no warning, with outages ranging from minutes to days
- Power fluctuation is wild, with spikes and brown outs
Currently the offices will have some or all of the following:
- A generator, with an inverter, or some sort of manual switch
- A big UPS or battery array connecting a number of devices
- Several smaller APC UPS with computers attached
- Low cost Voltage Regulators sometimes connected between mains and UPS or device.
I know that each of these things needs to be appropriately rated for the equipment to which it is connected (although I am not sure how to calculate the correct rating).
The offices will generally have the following equipment (in varying quantities):
- some sort of internet connection device (VSAT router, ADSL modem, WiMax router)
- Cisco ASA 5505 firewall
- a bunch of PCs
- one server
I don't seek to replace the advice of an electrician, but in some of these locations they only answer the questions you ask them, so I need to make sure I have enough understanding of the essentials to protect equipment from damage, and possibly get through some power cuts.